Quote Originally Posted by Jon S View Post
I am somewhat baffled about where this idea of running the motors at a lower voltage has come from
A VFD run from a 240V supply just rectifies the input, so unless it includes a voltage doubler on the input (don't know if that's something that's available, wouldn't be surprised) it cannot run the motor on 415v.

This article explains about the various ways:
http://reviews.ebay.co.uk/3-THREE-PH...00000001476333